Falling asleep suddenly

My Husband to be has alot of medical issues including Diabetes , neuropathy , diabetic retinapathy, High blood pressure, High cholesterol, thyroid, arthritis in every joint, and he suffers from chronic pain. He used to hav problem falling asleep and staying asleep and would stay awake for DAYS , but here lately he has been just falling asleep everywhere. He falls asleep while talking , watching TV, Sitting in a chair and worse Standing.
He put somthing in the microwave the other day for 30 seconds and fell asleep standing in front of the microwave. He woke when He fell into it but this was also the first time he fell over while sleeping standing up. I cant understand why somtimes he wont sleep for days and why he can fall asleep standing up all at the same time.... Please help anyone : (

My Husband to be has alot of medical issues including Diabetes , neuropathy , diabetic retinapathy, High blood pressure, High cholesterol, thyroid, arthritis in every joint, and he suffers from chronic pain. He used to hav problem falling asleep and staying asleep and would stay awake for DAYS , but here lately he has been just falling asleep everywhere. He falls asleep while talking , watching TV, Sitting in a chair and worse Standing.
He put somthing in the microwave the other day for 30 seconds and fell asleep standing in front of the microwave. He woke when He fell into it but this was also the first time he fell over while sleeping standing up. I cant understand why somtimes he wont sleep for days and why he can fall asleep standing up all at the same time.... Please help anyone : (

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